Damn... I feel for you. My situation is quite different. I'm divorced now. My ex left for another brother who didn't question his faith (well, he is now - irony). But my 2 children go out in the service and meetings, and are told, even indirectly, that I am an apostate, hence, to not be believed. I have converted to atheism in the span on the past years, evolution being a big point of argument.
But this is my advice, for what it's worth.
Encourage your children to listen carefully to the meetings and their mom. Tell them that they must find our for themselves what the truth is. Point out that you encourage knowledge, while asking them if they find it fair that you shouldn't be able to share your conclusions also. Kids have an innate hate for unfairness. If they see you encourage them to study and know their Bible, and that mom demonizes anything that comes out of your mouth - THEY WILL eventually get the big picture.
I made a pact with my ex that made a fair point; I DID teach the kids the WTS's teachings in earnest. So I am the one that changed my mind. The kids know that. I tell them that it took me a long time to realize what I know see as truth… and that they too, will have an opportunity to decide what makes sense to them.
In short, use the kung-fu method. Don't punch back, just use all the weight of their mother's arguments and let them fall flat by themselves. Truth fears no examination - and the WTS fears it A LOT!
At the end, whether my kids decide to become JWs or follow the path of reason and Scientific evidence is up to them, and both parents MUST respect that. My kids are now 13 and 11 - and as of now HAVE NO INTENTION to get baptized, but they still appreciate the community. I grant them that with peace and pleasure. Logic is getting to them a little at a time.
The worse thing you can do is fight and court - especially if you win. The kids will never forgive you for separating them from their mom. Don't let the bitterness get to you. Be in peace and a constant stronghold for your kids. THe parent that wins is always the one that showed true love and respect for the other parent, and the intelligence of their kids.
This is thru experience - for what it's worth.
*Technically, I too am just inactive. I'm waiting for that to change when they finally read my Facebook wall! LOL!